The extension is installed in the Google Chrome browser and helps automate sending via the web. whatsapp.com From us you can also buy a Whatsapp number database Extension can: - Send messages with attachments - Send mass mailings to a list of phone numbers - Set the interval between sending messages - Load (you can specify any) contacts from CSV with additional fields - Insert additional fields from the number database into the message (you can randomize the text or contact by name) - Phone numbers do not have to be in your contacts - Extension for Google Chrome browser - windows operating system The extension is multifunctional and has the most intuitive interface.